Quality control & evaluation of aerosol

M.Pharm I Sem,2008-09,GCP Aurangabad

129/12/2008

Quality Control & Evaluation Of Pharmaceutical Aerosols

Prepared By: Mahesh W. Thube, M.Pharm Ist Sem,

GCP Aurangabad,

M.Pharm I Sem,2008-09,GCP Aurangabad

229/12/2008

•QUALITY CONTROL TESTS

It Includes the testing of :

» 1. Propellents

» 2. Valves, Actuator, Dip Tubes

» 3. Containers

» 4. Weight Checking

» 5. Leak Testing

» 6. Spray Testing

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1.Propellents:

All Propellents are accompanied by Specification sheet.

Parameter Tested By

Identification

Purity

Gas Chromatography

Moisture, Halogen, Non-Volatile Residue Determination

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2.Valves, Actuator, Dip-tubesSampling is done according to standard procedure as found in Military Standards “MIL-STD-105D”.

For metered dose aerosols test methods was developed by ‘Aerosol Specification Committee’

‘Industrial Pharmaceutical Technical Section

‘Academy Of Pharmaceutical Sciences.

The object of this test is to determine magnitude of valve delivery & degree of uniformity between individual valves.

Standard test solutions were proposed to rule out variation in valve delivery.

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Test SolutionsIngredients% w/w

Test Solutions ‘A’

Test Solutions ‘B’

Test Solutions ‘C’

Iso Propyl Myristate 0.10% 0.10% 0.10%

Dichloro Difluoro methane

49.95% 25.0% 50.25%

Dichloro tetrafluoro ethane

49.95% 25.0% 24.75%

Trichloro monofluoro methane

- - 24.9%

Alcohol USP - 49.9% -

Specific Gravity @ 25°c

1.384 1.092 1.388

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Testing Procedure:Take 25 valves & placed on containers,

Filled with specific test solution

Actuator with 0.020 inch orifice is attached.

Valve is actuated to fullest extent for 2 sec.

Repeat this for total 2 individual delivery from each 25 test units.

Individual delivery wt in mg.Valve delivery per actuation in µL = Specific gravity of test soln

Valve Acceptance: Deliveries Limit’s54µL or less ± 15%55 to 200 µL ± 10%

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Contd..

Of 50 deliveryIf 4 or more are outside limits : valves are rejected

If 3 delivery are outside limits : another 25 valves are tested : lot is rejected if more than 1 delivery outside

specification

If 2 delivery from 1 valve are beyond limits : another 25 valves are tested : lot is rejected if more than

1 delivery outside specification

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3.ContainersContainers are examined for defects in lining.

Q.C aspects includes degree of conductivity of electric current as measure of exposed metals.

Glass containers examined for Flaws.

4.Weight CheckingIs done by periodically adding tared empty aerosol container to filling lines which after filling with concentrate are removed & weighed.

Same procedure is used for checking weight of Propellents.

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5.Leak TestIs done by measuring the Crimp’s dimension & comparing.

Final testing of valve closure is done by passing filled containers through water bath.

6.Spray TestingIt is done for

»To clear dip tube of pure propellant & concentrate,

»To check for defects in valves & spray pattern.

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Evaluation Tests:A. Flammability & combustibility:

1.Flash point

2.Flash Projection

B. Physicochemical characteristics:

1.Vapour pressure

2.Density

3.Moisture content

4.Identification of Propellents

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Contnd…

C. Performance: 1. Aerosol valve discharge rate

2. Spray pattern

3. Dosage with metered valves

4. Net contents

5. Foam stability

6. Particle size determination

D. Biological testing: 1.Therapeutic activity

2.Toxicity studies

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A. Flammability & combustibility:

» 1.Flash point: Apparatus : Open Cup Tag Apparatus

Test liquids temp. is allowed to increase

slowly & temp. at which vapors Ignite is

called as Flash Point .

» 2.Flame Projection:

Product is sprayed for 4 sec

onto flame & exact length is

measured with ruler.

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B. Physicochemical characteristics:

Property Method

1. Vapor Pressure » Can Puncturing Device.

2. Density » Hydrometer,

» Pycnometer.

3. Moisture » Karl Fisher Method,

» Gas Chromatography.

4. Identification » Gas Chromatography,

» IR Spectroscopy.

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C. Performance:

1.Aerosol valve discharge rate :Aerosol product of known weight is discharged for specific time.

By reweighing the container, the change in the wt. per time dispensed is the Discharge rate in gm/sec.

2. Spray pattern :The method is based on the

impingement of spray on

piece of paper that has

treated with Dye-Talc

mixture.

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3. Dosage with metered valves :Reproducibility of dosage determined by:

»Assay

»Accurate weighing of filled container followed by dispensing several dosage.

containers again reweighed & diff. in wt. divided by no. of dosage dispensed gives average dose.

4. Net Contents :Tared cans placed on filling lines are reweighed & then difference in wt. is equal to net content.

In Destructive method : opening the container & removing as much of product possible.

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5. Foam stability :Various Methods : » Visual Evaluation,

» Time for given mass to penetrate the foam,

» Time for given rod to fall which is inserted into the foam,

» Rotational Viscometer.

6.Partical Size Determination : Methods : » Cascade Impactor,

» Light Scattering Decay.

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a). Cascade Impactor :Principle : Stream of particle projected through a series of nozzle & glass slides at high velocity, larger particle are impacted on low velocity stage , & smaller on higher velocity stage.

b). Light Scattering Decay :Principal : As aerosol settles under turbulent condition, the changes in the light of a Tyndall beam is measured.

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D. Biological testing:

1.Therapeutic Activity : » For Inhalation Aerosols : is depends on the particle size.

» For Topical Aerosols : is applied to test areas & adsorption of therapeutic

ingredient is determined.

2.Toxicity : » For Inhalation Aerosols : exposing test animals to vapor

sprayed from Aerosol container.

» For Topical Aerosols : Irritation & Chilling effects are determined.

M.Pharm I Sem,2008-09,GCP Aurangabad

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References:

“The Theory & Practice Of Industrial Pharmacy” by Leon Lachman, H.A.Liberman, Joseph Kanig, 3rd Edition, Varghese Pub., page no. 613-618.

Remington’s “The Science & Practice Of Pharmacy” 3rd Edition, Volume-I, page no.1014-1015.

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